There seem to be a number of missing error messages. For example:
tools/ab_compare.sh ~/Videos/akiyo_qcif.y4m
No method of determining file size specified.
This should probably say you need to use the -b <bpp> parameter. When you add
this,
tools/ab_compare.sh -b 0.1 ~/Videos/akiyo_qcif.y4m
it produces no output and does nothing. Adding -c <codec> parameter,
tools/ab_compare.sh -b 0.1 -c daala ~/Videos/akiyo_qcif.y4m
it still produces no output and does nothing.

It looks like the problem is that I am doing an out of tree build. Adding the
missing DAALA_ROOT gives,
DAALA_ROOT=build tools/ab_compare.sh -b 0.1 ~/Videos/akiyo_qcif.y4m
mv: cannot stat ‘00000000out-akiyo_qcif.y4m-255-tmp.y4m’: No such file or
directory